Gilberto is a hard-working college freshman. One Tuesday, he decides to work nonstop until he has answered 250 practice problems for his physics course. He starts work at 8:00 AM and uses a table to keep track of his progress throughout the day. He notices that as he gets tired, it takes him longer to solve each problem. Time Total Problems Answered 8:00 AM 0 9:00 AM 100 10:00 AM 175 11:00 AM 225 Noon 250 Use the table to answer the following questions. The marginal, or additional, gain from Gilberto’s first hour of work, from 8:00 AM to 9:00 AM, isproblems. The marginal gain from Gilberto’s third hour of work, from 10:00 AM to 11:00 AM, isproblems. Later, the teaching assistant in Gilberto’s physics course gives him some advice. "Based on past experience," the teaching assistant says, "working on 62.5 problems raises a student’s exam score by about the same amount as reading the textbook for 1 hour." For simplicity, assume students always cover the same number of pages during each hour they spend reading. Given this information, in order to use his 4 hours of study time to get the best exam score possible, how many hours should he have spent working on problems, and how many should he have spent reading? A. 0 hours working on problems, 4 hours reading
B. 1 hour working on problems, 3 hours reading
C. 2 hours working on problems, 2 hours reading
D. 4 hours working on problems, 0 hours reading